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![Sheng Yong](/assets/img/avatar_default.png)
In the case where we have more than one volumes on different UBI devices, it may be not that easy to tell which volume prints the messages. Add ubi number and volume id in ubifs_msg/warn/error to help debug. These two values are passed by struct ubifs_info. For those where ubifs_info is not initialized yet, ubifs_* is replaced by pr_*. For those where ubifs_info is not avaliable, ubifs_info is passed to the calling function as a const parameter. The output looks like, [ 95.444879] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 696 [ 95.484688] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "test1" [ 95.484694] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.484699] UBIFS (ubi0:1): FS size: 30220288 bytes (28 MiB, 238 LEBs), journal size 1523712 bytes (1 MiB, 12 LEBs) [ 95.484703] UBIFS (ubi0:1): reserved for root: 1427378 bytes (1393 KiB) [ 95.484709] UBIFS (ubi0:1): media format: w4/r0 (latest is w4/r0), UUID 40DFFC0E-70BE-4193-8905-F7D6DFE60B17, small LPT model [ 95.489875] UBIFS (ubi1:0): background thread "ubifs_bgt1_0" started, PID 699 [ 95.529713] UBIFS (ubi1:0): UBIFS: mounted UBI device 1, volume 0, name "test2" [ 95.529718] UBIFS (ubi1:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 95.529724] UBIFS (ubi1:0): FS size: 19808256 bytes (18 MiB, 156 LEBs), journal size 1015809 bytes (0 MiB, 8 LEBs) [ 95.529727] UBIFS (ubi1:0): reserved for root: 935592 bytes (913 KiB) [ 95.529733] UBIFS (ubi1:0): media format: w4/r0 (latest is w4/r0), UUID EEB7779D-F419-4CA9-811B-831CAC7233D4, small LPT model [ 954.264767] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node type (255 but expected 6) [ 954.367030] UBIFS error (ubi1:0 pid 756): ubifs_read_node: bad node at LEB 0:0, LEB mapping status 1 Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
250 lines
6.7 KiB
C
250 lines
6.7 KiB
C
/*
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* This file is part of UBIFS.
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*
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* Copyright (C) 2006-2008 Nokia Corporation.
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* Copyright (C) 2006, 2007 University of Szeged, Hungary
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Authors: Adrian Hunter
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* Artem Bityutskiy (Битюцкий Артём)
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* Zoltan Sogor
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*/
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/*
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* This file provides a single place to access to compression and
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* decompression.
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*/
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#include <linux/crypto.h>
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#include "ubifs.h"
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/* Fake description object for the "none" compressor */
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static struct ubifs_compressor none_compr = {
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.compr_type = UBIFS_COMPR_NONE,
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.name = "none",
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.capi_name = "",
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};
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#ifdef CONFIG_UBIFS_FS_LZO
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static DEFINE_MUTEX(lzo_mutex);
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static struct ubifs_compressor lzo_compr = {
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.compr_type = UBIFS_COMPR_LZO,
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.comp_mutex = &lzo_mutex,
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.name = "lzo",
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.capi_name = "lzo",
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};
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#else
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static struct ubifs_compressor lzo_compr = {
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.compr_type = UBIFS_COMPR_LZO,
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.name = "lzo",
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};
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#endif
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#ifdef CONFIG_UBIFS_FS_ZLIB
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static DEFINE_MUTEX(deflate_mutex);
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static DEFINE_MUTEX(inflate_mutex);
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static struct ubifs_compressor zlib_compr = {
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.compr_type = UBIFS_COMPR_ZLIB,
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.comp_mutex = &deflate_mutex,
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.decomp_mutex = &inflate_mutex,
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.name = "zlib",
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.capi_name = "deflate",
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};
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#else
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static struct ubifs_compressor zlib_compr = {
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.compr_type = UBIFS_COMPR_ZLIB,
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.name = "zlib",
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};
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#endif
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/* All UBIFS compressors */
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struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
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/**
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* ubifs_compress - compress data.
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* @in_buf: data to compress
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* @in_len: length of the data to compress
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* @out_buf: output buffer where compressed data should be stored
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* @out_len: output buffer length is returned here
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* @compr_type: type of compression to use on enter, actually used compression
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* type on exit
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*
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* This function compresses input buffer @in_buf of length @in_len and stores
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* the result in the output buffer @out_buf and the resulting length in
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* @out_len. If the input buffer does not compress, it is just copied to the
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* @out_buf. The same happens if @compr_type is %UBIFS_COMPR_NONE or if
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* compression error occurred.
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*
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* Note, if the input buffer was not compressed, it is copied to the output
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* buffer and %UBIFS_COMPR_NONE is returned in @compr_type.
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*/
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void ubifs_compress(const struct ubifs_info *c, const void *in_buf,
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int in_len, void *out_buf, int *out_len, int *compr_type)
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{
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int err;
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struct ubifs_compressor *compr = ubifs_compressors[*compr_type];
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if (*compr_type == UBIFS_COMPR_NONE)
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goto no_compr;
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/* If the input data is small, do not even try to compress it */
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if (in_len < UBIFS_MIN_COMPR_LEN)
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goto no_compr;
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if (compr->comp_mutex)
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mutex_lock(compr->comp_mutex);
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err = crypto_comp_compress(compr->cc, in_buf, in_len, out_buf,
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(unsigned int *)out_len);
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if (compr->comp_mutex)
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mutex_unlock(compr->comp_mutex);
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if (unlikely(err)) {
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ubifs_warn(c, "cannot compress %d bytes, compressor %s, error %d, leave data uncompressed",
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in_len, compr->name, err);
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goto no_compr;
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}
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/*
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* If the data compressed only slightly, it is better to leave it
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* uncompressed to improve read speed.
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*/
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if (in_len - *out_len < UBIFS_MIN_COMPRESS_DIFF)
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goto no_compr;
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return;
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no_compr:
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memcpy(out_buf, in_buf, in_len);
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*out_len = in_len;
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*compr_type = UBIFS_COMPR_NONE;
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}
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/**
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* ubifs_decompress - decompress data.
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* @in_buf: data to decompress
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* @in_len: length of the data to decompress
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* @out_buf: output buffer where decompressed data should
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* @out_len: output length is returned here
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* @compr_type: type of compression
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*
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* This function decompresses data from buffer @in_buf into buffer @out_buf.
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* The length of the uncompressed data is returned in @out_len. This functions
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* returns %0 on success or a negative error code on failure.
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*/
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int ubifs_decompress(const struct ubifs_info *c, const void *in_buf,
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int in_len, void *out_buf, int *out_len, int compr_type)
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{
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int err;
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struct ubifs_compressor *compr;
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if (unlikely(compr_type < 0 || compr_type >= UBIFS_COMPR_TYPES_CNT)) {
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ubifs_err(c, "invalid compression type %d", compr_type);
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return -EINVAL;
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}
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compr = ubifs_compressors[compr_type];
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if (unlikely(!compr->capi_name)) {
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ubifs_err(c, "%s compression is not compiled in", compr->name);
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return -EINVAL;
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}
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if (compr_type == UBIFS_COMPR_NONE) {
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memcpy(out_buf, in_buf, in_len);
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*out_len = in_len;
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return 0;
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}
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if (compr->decomp_mutex)
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mutex_lock(compr->decomp_mutex);
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err = crypto_comp_decompress(compr->cc, in_buf, in_len, out_buf,
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(unsigned int *)out_len);
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if (compr->decomp_mutex)
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mutex_unlock(compr->decomp_mutex);
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if (err)
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ubifs_err(c, "cannot decompress %d bytes, compressor %s, error %d",
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in_len, compr->name, err);
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return err;
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}
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/**
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* compr_init - initialize a compressor.
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* @compr: compressor description object
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*
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* This function initializes the requested compressor and returns zero in case
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* of success or a negative error code in case of failure.
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*/
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static int __init compr_init(struct ubifs_compressor *compr)
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{
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if (compr->capi_name) {
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compr->cc = crypto_alloc_comp(compr->capi_name, 0, 0);
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if (IS_ERR(compr->cc)) {
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pr_err("UBIFS error (pid %d): cannot initialize compressor %s, error %ld",
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current->pid, compr->name, PTR_ERR(compr->cc));
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return PTR_ERR(compr->cc);
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}
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}
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ubifs_compressors[compr->compr_type] = compr;
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return 0;
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}
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/**
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* compr_exit - de-initialize a compressor.
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* @compr: compressor description object
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*/
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static void compr_exit(struct ubifs_compressor *compr)
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{
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if (compr->capi_name)
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crypto_free_comp(compr->cc);
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return;
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}
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/**
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* ubifs_compressors_init - initialize UBIFS compressors.
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*
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* This function initializes the compressor which were compiled in. Returns
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* zero in case of success and a negative error code in case of failure.
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*/
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int __init ubifs_compressors_init(void)
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{
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int err;
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err = compr_init(&lzo_compr);
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if (err)
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return err;
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err = compr_init(&zlib_compr);
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if (err)
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goto out_lzo;
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ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
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return 0;
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out_lzo:
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compr_exit(&lzo_compr);
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return err;
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}
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/**
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* ubifs_compressors_exit - de-initialize UBIFS compressors.
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*/
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void ubifs_compressors_exit(void)
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{
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compr_exit(&lzo_compr);
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compr_exit(&zlib_compr);
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}
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